P CODES (POWERTRAIN) P0400 - P0499 P0420

What Sensor Do I Have To Replace With P0420 Code My Car

Car First Started Missing, Not Backfiring, When I Stepped On Accelartor Harder It Would Almost Die, Make A Popping Noise, Bilge Black...

I Am Getting P0420 On My Vehicle Listed Above Base Model With 154,000 Km (95,691 Miles). Replaced Spark Plugs And O2 Censor. Used Fuel...

I Have A 2003 Chevy Impala With A 3.8 V^. Back A Couple Of Months Ago My Check Engine Light Came On And There Was A Code Of Po420 So I Went...

Hello I Have A Mercury Mystique With 144,000 Miles. I Purchased It Used In June Of 2009 So I Don't Know What Work Has Been Done On It(if Any...

A Couple Of Months Ago, My Car Started Shaking, With A P2191 Code. I Took It To A Shop, They Told Me The Fuel Injectors Have Carbon Build...

P0420 - Catalyst Efficiency Below Threshold Bank 1 Message Dor Check Engine Light. Repairs Already Completed Catalytic Converter(s)...

I Am Getting A Dtc P0420 From The Computer. The Car Is Running Fine. Does The Catalytic Converter Need To Be Replaced? Could It Be An Oxygen...

Wondering If Its Safe To Run This Seafoam Cleaner Through Electronic Throttle? Started With A Dreaded Rattle That Sounded Like The Converter...

I Had The Check Engine Light Come On And Was Told That The Code Came Up As P0420. He Told Me That It Is A Problem With The Catalyic...